QUANTIFICATION OF THE INFLUENCE OF DESIGN PARAMETERS ON INDUCED STRESS AT THE PRODUCTION LEVEL IN BLOCK CAVING MINING

• Main Author: Wijaya, Mario
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74459
• Institution: Institut Teknologi Bandung

Block caving method is a method used in large-scale underground metal and mineral extraction in the mining industry. The factors influencing the efficiency of ore extraction are stability at the production level, with the largest factor being induced stress. The factors affecting induced stress at the production level are hydraulic radius, the distance between production levels and undercuts, and the selection of undercut methods (Butcher, 1999). Laubscher (1994) and Butcher (1999) conducted empirical studies on block caving design. The parameters discussed in these studies include hydraulic radius, differences in distance between production levels and undercuts, and the undercut method's impact on induced stress at the production level (Roof - floor). The study results show that the larger the hydraulic radius, the higher the maximum induced stress value at the production level, with stress decreasing from the roof to the floor. The comparative analysis of advance undercut and post undercut regarding the height of the undercut-production level with HR 15, 25, and 50 will experience an increase with the increase in hydraulic radius. The use of the advance undercut method results in a stress reduction of 1.4%, 2.85%, and 4.85% at heights of 10m, 15m, and 20m respectively. Each increase in the difference in height between the undercut and production level from 10m to 20m shows a decrease in induced stress for each undercut type. The analysis of observations between the production level and undercut for the lower part of the caving zone, at distances of 10m, 15m, and 20m between the production level and undercut, shows a decrease for each hydraulic radius.